Lassen sich KfW- und Landesförderung gleichzeitig nutzen?

Grundsätzlich ja, sofern beide unterschiedliche Fördergegenstände betreffen oder die jeweiligen Beihilferegeln die Kumulierung zulassen. Viele Landesförderbanken erlauben ihre Programme ausdrücklich ergänzend zur KfW-Neubauförderung. Maßgeblich sind die Kumulierungsregeln des jeweiligen Landesprogramms — sie stehen in den Förderbedingungen der Landesbank (Quelle: Landesförderbanken / kfw.de, Stand 2026).

Was bedeutet das Verbot der Doppelförderung?

Dieselbe Ausgabe darf nicht zweimal gefördert werden. Wenn ein Programm bereits eine bestimmte Maßnahme oder Kostenposition finanziert, darf kein zweites Programm exakt dieselbe Position erneut fördern. Kombinierbar sind daher vor allem Programme mit unterschiedlichen Fördergegenständen — etwa Effizienz (KfW) plus Familienunterstützung (Land) plus PV-Speicher (Kommune).

Kann ich KFN und WEF zusammen beantragen?

Nein, KFN (297/298) und Wohneigentum für Familien (WEF 300) schließen sich für dasselbe Neubauvorhaben aus — Sie wählen das Programm, dessen Voraussetzungen Sie erfüllen. WEF ist zinslich günstiger, setzt aber mindestens ein Kind im Haushalt, die Einkommensgrenze und Selbstnutzung voraus. Kombinierbar bleiben beide mit Landesprogrammen und dem ergänzenden Bankdarlehen (Quelle: kfw.de, Stand 2026).

Wer prüft, ob mein Förder-Stapel zulässig ist?

In erster Linie Ihr Finanzierungspartner (Hausbank, Sparkasse oder Vermittler) zusammen mit der Landesförderbank. Der Energieeffizienz-Experte hilft bei den technischen Nachweisen. Da die Regeln je Land unterschiedlich sind, sollten Sie die Kumulierbarkeit vor Antragstellung schriftlich bestätigen lassen.

Sind kommunale Zuschüsse mit der KfW-Förderung vereinbar?

Meist ja, weil Kommunen oft Einzelmaßnahmen mit anderem Fördergegenstand bezuschussen — etwa Zisternen, Gründächer oder PV-Speicher. Solange kein Kostenposten doppelt gefördert wird, ergänzen sich kommunale Zuschüsse und KfW-Darlehen. Fragen Sie vor dem Bauantrag bei Ihrer Gemeinde nach; viele Töpfe bleiben ungenutzt (Quelle: Kommunen, Stand 2026).

Combining subsidies: KfW, state & municipality stacking

This translation is for orientation only. Solely the German version of this page and the official KfW program sheets are legally authoritative.

Multiple funding pots can be combined as long as they concern different subsidy objects. We show the basic principle, an example stack as reference value and where the limit of double subsidy lies (Stand 2026).

Short answer

What is cumulable?

The principle states: different subsidy objects may be combined, the same cost position not twice. Note: KFN (297/298) and WEF 300 are mutually exclusive for the same project - you choose one of the two KfW programs; additionally state programs (different object, depending on the cumulation rule of the state bank) and municipal grants for individual measures are added. Depending on the program up to 150.000 € (KFN with QNG) or up to 270.000 € (WEF) low-interest subsidy loan is possible (Stand 2026, range depending on QNG and number of children). The state aid rules and the conditions of the respective state bank are decisive.

Example stack as reference value

The following stack shows how programs with different subsidy object complement each other. From the two KfW loans you choose ONE (KFN or WEF — they exclude each other for the same project). All amounts are reference values (Stand 2026) and no commitment — whether the specific combination is permitted is examined by financing partners and the state bank.

Funding provider	Subsidy object	Type	Reference value
KfW — KFN 297/298	Energy efficiency house 40 (building, if applicable QNG)	Low-interest loan	up to 100.000 € / 150.000 € per residential unit
KfW — WEF 300 (alternative to KFN)	Owner-occupied first home ownership for families — not combinable with KFN, either-or	Low-interest loan	up to 270.000 € depending on number of children
State funding bank	Family / first acquisition subsidy (different object)	Loan or grant	Reference value 10.000 – 100.000 € (per state)
Municipality	Individual measure (e.g. cistern, green roof, PV storage)	Direct grant	Reference value 500 – 5.000 €

Stand 2026. State and municipal amounts vary greatly; binding are the current conditions of the KfW and the respective state funding bank.

What does not work when stacking

Double funding of the same cost position (double subsidy) by two programs.
Combination that exceeds the cumulation upper limit of a program.
State program that expressly excludes the KfW combination in its conditions.
KFN (297/298) and WEF 300 for the same new build project — the two KfW programs mutually exclude each other (source: KfW information sheet WEF 300, Stand 2026).

What is permitted on the other hand

Combine programs with different subsidy object.
Combine KfW loan (KFN or WEF) with state programs and bank loans.
Municipal individual measure grants supplementing the KfW loan.

Combine correctly without errors

Which programs come into question at all is shown in the overview of the subsidy programs. How to correctly incorporate the stack temporally in the application is in the subsidy process. And which stack errors become particularly expensive — for example the double subsidy — read under The most expensive subsidy errors.

Frequently asked questions on combining subsidies

Answers to cumulation, double subsidy and examination of the subsidy stack (Stand 2026).

Can KfW and state subsidy be used at the same time?

Basically yes, if both concern different subsidy objects or the respective state aid rules allow the cumulation. Many state funding banks expressly allow their programs as a supplement to KfW new construction subsidy. Decisive are the cumulation rules of the respective state program — they are in the subsidy conditions of the state bank (source: state funding banks / kfw.de, Stand 2026).

What does the ban on double subsidy mean?

The same expenditure must not be subsidized twice. If a program already finances a certain measure or cost position, no second program may subsidize exactly the same position again. Therefore mainly programs with different subsidy objects are combinable — for example energy efficiency (KfW) plus family support (state) plus PV storage (municipality).

Can I apply for KFN and WEF together?

No, KFN (297/298) and home ownership for families (WEF 300) exclude each other for the same new construction project — you choose the program whose requirements you fulfill. WEF is more interest favorable but requires at least one child in the household, the income limit and self-use. Both remain combinable with state programs and the supplementary bank loan (source: kfw.de, Stand 2026).

Who checks if my subsidy stack is permissible?

Primarily your financing partner (house bank, savings bank or intermediary) together with the state funding bank. The energy efficiency expert helps with the technical verifications. Since the rules are different per state, you should have the combinability confirmed in writing before application.

Are municipal grants compatible with KfW subsidy?

Usually yes, because municipalities often subsidize individual measures with a different subsidy object — for example cisterns, green roofs or PV storage. As long as no cost item is subsidized twice, municipal grants and KfW loan complement each other. Ask at your municipality before the building application; many pots remain unused (source: municipalities, Stand 2026).

Find the optimal subsidy stack

Request offers from subsidy-eligible providers — with verified EH40 standard as basis for every stack. Free of charge and non-binding.

Obtain free offers

Combining subsidies: KfW, state & municipality stacking

What is cumulable?

Example stack as reference value

What does not work when stacking

What is permitted on the other hand

Combine correctly without errors

Frequently asked questions on combining subsidies

Find the optimal subsidy stack

To suitable support in one minute

Quick inquiry

Secure offers

Dream House Radar

Order catalogues